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//
// detail/descriptor_read_op.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_ASIO_DETAIL_DESCRIPTOR_READ_OP_HPP
#define BOOST_ASIO_DETAIL_DESCRIPTOR_READ_OP_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#if !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__)
#include <boost/asio/detail/bind_handler.hpp>
#include <boost/asio/detail/buffer_sequence_adapter.hpp>
#include <boost/asio/detail/descriptor_ops.hpp>
#include <boost/asio/detail/fenced_block.hpp>
#include <boost/asio/detail/handler_work.hpp>
#include <boost/asio/detail/memory.hpp>
#include <boost/asio/detail/reactor_op.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename MutableBufferSequence>
class descriptor_read_op_base : public reactor_op
{
public:
descriptor_read_op_base(int descriptor,
const MutableBufferSequence& buffers, func_type complete_func)
: reactor_op(&descriptor_read_op_base::do_perform, complete_func),
descriptor_(descriptor),
buffers_(buffers)
{
}
static status do_perform(reactor_op* base)
{
descriptor_read_op_base* o(static_cast<descriptor_read_op_base*>(base));
buffer_sequence_adapter<boost::asio::mutable_buffer,
MutableBufferSequence> bufs(o->buffers_);
status result = descriptor_ops::non_blocking_read(o->descriptor_,
bufs.buffers(), bufs.count(), o->ec_, o->bytes_transferred_)
? done : not_done;
BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_read",
o->ec_, o->bytes_transferred_));
return result;
}
private:
int descriptor_;
MutableBufferSequence buffers_;
};
template <typename MutableBufferSequence, typename Handler>
class descriptor_read_op
: public descriptor_read_op_base<MutableBufferSequence>
{
public:
BOOST_ASIO_DEFINE_HANDLER_PTR(descriptor_read_op);
descriptor_read_op(int descriptor,
const MutableBufferSequence& buffers, Handler& handler)
: descriptor_read_op_base<MutableBufferSequence>(
descriptor, buffers, &descriptor_read_op::do_complete),
handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
{
handler_work<Handler>::start(handler_);
}
static void do_complete(void* owner, operation* base,
const boost::system::error_code& /*ec*/,
std::size_t /*bytes_transferred*/)
{
// Take ownership of the handler object.
descriptor_read_op* o(static_cast<descriptor_read_op*>(base));
ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
handler_work<Handler> w(o->handler_);
BOOST_ASIO_HANDLER_COMPLETION((*o));
// Make a copy of the handler so that the memory can be deallocated before
// the upcall is made. Even if we're not about to make an upcall, a
// sub-object of the handler may be the true owner of the memory associated
// with the handler. Consequently, a local copy of the handler is required
// to ensure that any owning sub-object remains valid until after we have
// deallocated the memory here.
detail::binder2<Handler, boost::system::error_code, std::size_t>
handler(o->handler_, o->ec_, o->bytes_transferred_);
p.h = boost::asio::detail::addressof(handler.handler_);
p.reset();
// Make the upcall if required.
if (owner)
{
fenced_block b(fenced_block::half);
BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
w.complete(handler, handler.handler_);
BOOST_ASIO_HANDLER_INVOCATION_END;
}
}
private:
Handler handler_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__)
#endif // BOOST_ASIO_DETAIL_DESCRIPTOR_READ_OP_HPP
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